Question

How to replace each repeated letter in a string with one letter in C

Answer 1

#include <stdio.h>

void replaceEachRepeatedLetterByOneLetter(char* str) {
    int index = 0;
    
    for (int i = 0; str[i] != '\0'; i++) {
        if (i == 0 || str[i] != str[i - 1]) {
            str[index++] = str[i];
        }
    }
    
    str[index] = '\0';
}

int main() {
    char str[] = "aabbbccccccccccdefgggggggggggg";

    replaceEachRepeatedLetterByOneLetter(str);
    
    printf("%s", str);
}


 
 
/*
run:
    
abcdefg
    
*/

 

Cleaner teeth, healthier you!
Get The Secret to a Bright and Healthy Smile