new_contents: from .gcc_executor import GCCExecutor
  
  
  class Executor(GCCExecutor):
      command = 'gcc11'
      flags = ['-std=c11']
      ext = '.c'
      name = 'C11'
      test_program = '''
  #include <stdio.h>
  
  int main() {
      int ch;
      while ((ch = getchar()) != EOF)
          putchar(ch);
      return 0;
  }
  '''
  
subject: Add C11 executor support; #276