Jimmy you lazy motherfucker, do your work

//
public int diff21(int n) {
  if (n > 21) {
    return (n - 21)*2;
  } else {
    return 21 - n;
  }
}
//
public boolean parrotTrouble(boolean talking, int hour) {
  if (talking && (hour > 20 || hour < 7)) {
    return true;
  } else {
    return false;
  }
}
//
public boolean makes10(int a, int b) {
  if (a == 10 || b == 10 || a + b == 10) {
    return true;
  } else {
    return false;
  }
}
//
public boolean nearHundred(int n) {
  if (Math.abs(n - 100) <= 10 || Math.abs(n - 200) <= 10) {
    return true;
  } else {
    return false;
  }
}
//
public boolean posNeg(int a, int b, boolean negative) {
  if (negative) {
    return (a < 0 && b < 0);
  }
  else {
    return ((a < 0 && b > 0) || (a > 0 && b < 0));
  }
}
//
public String notString(String str) {
  if (str.startsWith("not")) {
    return str;
  } else {
    return "not " + str;
  }
}
//
public String missingChar(String str, int n) {
  String front = str.substring(0, n);
  String back = str.substring(n+1, str.length());

  return front + back;
}
//
public String frontBack(String str) {
   if (str.length() < 2) {
     return str;
   } else {
   char fletter = str.charAt(0);
   char lletter = str.charAt(str.length() - 1);
   String middle = str.substring(1, str.length() - 1);
   return lletter + middle + fletter;
   }
}
//
public String front3(String str) {
  if (str.length() < 3) {
    return str + str + str;
  } else {
  String start = str.substring(0, 3);
  return start + start + start;
  }
}
//
public String backAround(String str) {
  char c1 = str.charAt(str.length() - 1);
  return c1 + str + c1;
}
//
public boolean or35(int n) {
  if(n%3 == 0 || n%5 == 0) {
    return true;
  } else {
    return false;
  }
}
//
public String front22(String str) {
  if(str.length() < 3) {
    return str + str + str;
  } else {
    String s1 = str.substring(0,2);
    return s1 + str + s1;
  }
}
//
public boolean startHi(String str) {
  if(str.startsWith("hi")) {
    return true;
  } else {
    return false;
  }
}
//
public boolean icyHot(int temp1, int temp2) {
  if ((temp1 > 100 && temp2 < 0) || (temp1 < 0  && temp2 > 100)) {
            return true;
        } else {
            return false;
        }
}
//
public boolean in1020(int a, int b) {
  if ((a <= 20 && a >= 10) || (b <= 20 && b >= 10)) {
    return true;
  } else {
    return false;
  }
}
//
public boolean hasTeen(int a, int b, int c) {
  if ((a <= 19 && a >= 13) || (b <= 19 && b >= 13) || (c <= 19 && c >= 13)) {
    return true;
  } else {
    return false;
  }
}
//