Why is my code inserting a new line when not requested? - c

Question

I am running a simple decryption function and printing the plain text onto a file. The problem is that right at the previous-to-last line, the code inserts a new line that is nonexistent in the original encrypted file.
Note this is an exercise and it's a requirement for my task that I don't use any library header other than <stdio.h>, <stdlib.h>, <stdbool.h>.
This is the part of the code in question. I am using the for loops to wipe both arrays.
printf("Introdueix el nom de l'arxiu el qual vols desencriptar. Es creara l'arxiu Text_desxifrat.txt amb el contingut desencriptat\n");
scanf("%s", n_arxiu);
fit_x = fopen(n_arxiu, "r");
fit = fopen("Text_desxifrat.txt", "w");
if (fit_x == NULL) printf("Error en obrir el fitxer\n");
else{
while (fgets(text_xifrat, MAX*2, fit_x) != NULL){
desxifrar_frase(text_xifrat, m_clau, text);
fprintf(fit, "%s\n", text);
for (i = 0; (text[i] > 64 && text[i] < 91) || (text[i] == 32) || (text[i] > 48 && text[i] < 58); i++) text[i] = '\0';
for (i = 0; (text_xifrat[i] > 64 && text_xifrat[i] < 91) || (text_xifrat[i] == 32) || (text_xifrat[i] > 48 && text_xifrat[i] < 58); i++) text_xifrat[i] = '\0';
}
fclose(fit_x);
fclose(fit);
This is the void function desxifrar_frase used in the code before.
void desxifrar_frase(char frase[], char matriu_x[][7], char frase_desxifrada[]){
int i = 0, comptador = 0, fila, col;
while (frase[i+1] > 64 && frase[i+1] < 91){
fila = trobar_element(frase[i], true, matriu_x);
col = trobar_element(frase[i+1], false, matriu_x);
frase_desxifrada[comptador] = matriu_x[fila][col];
comptador++;
i+=2;
}
}
The next is the function trobar_element, that searches for the unencrypted value having its coordinates. It returns the ascii value of a capital letter.
int trobar_element(char element, bool fila, char matriu_x[][7]){
bool trobat = false;
int i = 0, valor;
if (fila){
while (!trobat){
if (element == matriu_x[i][0]){
valor = i;
trobat = true;
}
i++;
}
}
else{
while (!trobat){
if (element == matriu_x[0][i]){
valor = i;
trobat = true;
}
i++;
}
}
return valor;
}
I have the original file with the following content:
Soneto a una nariz
Erase un hombre a una nariz pegado
erase una nariz superlativa
erase una nariz sayon y escriba
era Ovidio Nason mas naridado
muchisima nariz tan fiera
que en la cara de Anas fuera delito
Quevedo
And this is the content of the file when ran through the code:
Soneto a una nariz
Erase un hombre a una nariz pegado
erase una nariz superlativa
erase una nariz sayon y escriba
era Ovidio Nason mas naridado
muchisima nariz tan fiera
que en la cara de Anas fuera delito
Quevedo
I have tried removing the \n in
fprintf(fit, "%s\n", text);
but it will return every line of the original file crammed together except for the last line (Quevedo), which will be the only word in the next line.