Passing an array between functions - c

Question

I'm working on this program to convert bases of numbers to a new base. Primarily by converting the first base to 10, then converting ten to the new base. The actual conversions are working and when I pass it to main, it reads it correctly. However, when i pass 'charArray' to the 'findAnswer' function, it won't print out the values and my program crashes. so it's not being passed correctly I assume. Does anybody see the error I am making?
Output: 1101 [...then program crashes]
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
char** buildAnsArray(FILE *ifp);
char* baseConversion(int num, int base, int newBase);
char* pow2Converter(int num, int base, int newBase);
int findAnswer(char **answerArray, char **charArray, int high, int low);
int main()
{
int num, base, newBase;
char **answerArray;
char *answerBaseConversion;
char *answerPowConversion;
char charArray[10][10];
int i = 0;
FILE *ifp;
ifp = fopen("data.txt", "r");
answerArray = buildAnsArray(ifp);
while(fscanf(ifp, "%d %d %d\n", &num, &base, &newBase)!=EOF){
answerBaseConversion = baseConversion(num, base, newBase);//baseConversion(num, base, newBase);
strcpy(charArray[i],answerBaseConversion);
i++;
}
findAnswer(answerArray, charArray, i-1, 0);
free(answerArray);
fclose(ifp);
return 0;
}
char** buildAnsArray(FILE *ifp){
char *answerPtr;
int numConversions;
int i = 0; int j = 0;
char **answerArray;
char answerString[10];
fscanf(ifp, "%d\n", &numConversions);
answerArray = malloc(numConversions * sizeof(char*));
for (i = 0; i < numConversions; i++){
answerArray[i] = malloc(10 * sizeof(char));
}
while(j < numConversions){
fscanf(ifp, "%s\n", &answerString);
strcpy(answerArray[j],answerString);
j++;
}
return answerArray;
}
char* baseConversion(int num, int base, int newBase){
if(base == 10){
char a[2];
switch(num%newBase){
case 0:
a[0] = '0';
break;
case 1:
a[0] = '1';
break;
case 2:
a[0] = '2';
break;
case 3:
a[0] = '3';
break;
case 4:
a[0] = '4';
break;
case 5:
a[0] = '5';
break;
case 6:
a[0] = '6';
break;
case 7:
a[0] = '7';
break;
case 8:
a[0] = '8';
break;
case 9:
a[0] = '9';
break;
case 10:
a[0] = 'A';
break;
case 11:
a[0] = 'B';
break;
case 12:
a[0] = 'C';
break;
case 13:
a[0] = 'D';
break;
case 14:
a[0] = 'E';
break;
case 15:
a[0] = 'F';
break;
}
a[1] = '\0';
char *str;
if (num/newBase != 0)
str = baseConversion(num/newBase, base, newBase);
else{
str = malloc(11 * sizeof(char));
str[0] = '\0';
}
strcat(str, a);
return str;
}
else if(newBase==10){
int num3;
num3 = (((((((num/1000)*base)+((num%1000)/100))*base) + (((num%1000)%100)/10)) *base) + (((num%1000)%100)%10));
}
else{
char *str2 = baseConversion(num, base, 10);
int num2 = atoi(str2);
return baseConversion(num2, 10, newBase);
}
}
int findAnswer(char **answerArray, char **charArray, int high, int low){
printf("%s",answerArray[high]);
printf("%s", charArray[low]);
if(strcmp(answerArray[high], charArray[low])==0){
printf("WOO");
return low;//return to a string
}
else{
if (low == high)
return 0;//return to string? or recursion
else{
printf("hi");
return findAnswer(answerArray, charArray, high, low+1);//instead of returnning to output, return to a string.
}
}
}