C puts() without newline

puts() adds the newline character by the library specification. You can use printf instead, where you can control what gets printed with a format string:

printf("%s", input);

Typically one would use fputs() instead of puts() to omit the newline. In your code, the

puts(input);

would become:

fputs(input, stdout);

You can also write a custom puts function:

#include <stdio.h>

int my_puts(char const s[static 1]) {
    for (size_t i = 0; s[i]; ++i)
        if (putchar(s[i]) == EOF) return EOF;

    return 0;
}

int main() {
    my_puts("testing ");
    my_puts("C puts() without ");
    my_puts("newline");

    return 0;
}

Output:

testing C puts() without newline