How to Tokenize String without using strtok() - c

Question

I'm trying to tokenize a string without using a strtok().
When I run characters of string, it will print in each line.
For instance, when I run:
printfTokens("Hello from other side!");
The output should be:
Hello
from
other
side!
As I'm just learning C, I'm stuck for hours on how to implement this program. So far, I only know the basics and playing around with not (still haven't learned any calloc, malloc, etc).
So far I have this code, but the output does not print anything.
#include <stdio.h>
#include <string.h>
#define MAX_WORD 100
void printfTokens(char *inputString) {
int i;
/*int inputStringLength;
for(i = 0; inputString[i] != '/0'; i++) {
inputStringLength++;
}*/
while(inputString[i] != '\0') {
char testing[MAX_WORD];
while(inputString[i] != ' ') {
testing[inputString[i]]++;
i++;
}
printf("%s", testing);
i++;
}
}
int main() {
printfTokens("TESTING ONE! TWO! THREE!");
return 0;
}

Answer 1

You do not initialize the variable i.
while(inputString[i] != '\0') can be written while(inputString[i]).
testing[inputString[i]]++ makes sense to count the number of occurrences of a given character from inputString, but it does not make sense to print it. You may want to do something like:
while(1)
{
char testing[MAX_WORD], *t=testing;
while(inputString[i]&&(inputString[i]!=' '))
*t++=inputString[i++];
if (t>testing) printf("%s", testing);
if (!inputString[i]) break;
i++;
}
It would be better to name MAX_WORD_LENGTH instead of MAX_WORD.
These are a few problems in your code.

Answer 2

Sample tokenization function.
size_t tokenize(const char *inputString, const char *delim, char **argv, size_t maxtokens)
{
size_t ntokens = 0;
char *tokenized = strdup(inputString);
if(tokenized)
{
argv[0] = tokenized;
while(*tokenized)
{
if(strchr(delim, *tokenized))
{
*tokenized = 0;
ntokens++;
if(ntokens == maxtokens - 1)
{
break;
}
argv[ntokens] = tokenized + 1;
}
tokenized++;
}
}
return ntokens + 1;
}
int main()
{
char *tokens[10];
size_t ntokens = tokenize("TESTING ONE! TWO! THREE!", " ", tokens , 10);
for(size_t i = 0; i < ntokens; i++)
{
printf("Token[%zu] = `%s`\n", i, tokens[i]);
}
free(tokens[0]);
return 0;
}
https://godbolt.org/z/znv8PszG6