Example: Remove Non-Alphabets (Temporary String) in C

// Remove Non-Alphabets (Temporary String)
#include <stdio.h>
#include <string.h> // For strlen (not strictly needed for this loop, but good for general string ops)
#include <ctype.h>  // For isalpha

int main() {
    char originalString[] = "H3ll0, W0rld! 123";
    char cleanString[100]; // Assuming the cleaned string won't exceed 99 chars + null terminator
    int i, j;

    // Step 1: Initialize an index for the cleanString
    j = 0;

    // Step 2: Iterate through the original string
    for (i = 0; originalString[i] != '\0'; i++) {
        // Step 3: Check if the character is an alphabet using isalpha()
        if (isalpha(originalString[i])) {
            // Step 4: If it's an alphabet, copy it to the cleanString
            cleanString[j] = originalString[i];
            j++; // Increment index for cleanString
        }
    }
    // Step 5: Null-terminate the cleanString to make it a valid C string
    cleanString[j] = '\0';

    printf("Original string: %s\n", originalString);
    printf("Cleaned string: %s\n", cleanString);

    return 0;
}