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To remove spaces from a string in C, you can use the following code snippet:

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

int main() {
    char str[] = "This is a string with spaces";
    int i, j;

    for (i = 0, j = 0; str[i] != '\0'; i++) {
        if (str[i] != ' ') {
            str[j++] = str[i];
        }
    }
    str[j] = '\0';

    printf("String after removing spaces: %s\n", str);

    return 0;
}

This code snippet uses a loop to iterate through each character in the string. If the character is not a space, it is copied to a new position in the string, effectively removing the spaces. Finally, a null character is added at the end to terminate the string. The resulting string is then printed.

You can replace the str variable with your own string to remove spaces from a different string.