Question

How to remove the letters from word1 if they do not exist in word2 with C

Answer 1

#include <stdio.h>
#include <string.h>

void remove_non_common_letters(const char* word1, const char* word2, char* result) {
    int idx = 0;
    
    for (int i = 0; word1[i] != '\0'; ++i) {
        if (strchr(word2, word1[i])) {
            result[idx++] = word1[i];
        }
    }
    
    result[idx] = '\0'; // Null-terminate the result string
}

int main() {
    const char* word1 = "forest";
    const char* word2 = "tor";
    char result[64]; 

    remove_non_common_letters(word1, word2, result);

    printf("%s\n", result);

    return 0;
}



/*
run:

ort

*/

 

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