Warmup-1

• sleep_in
• monkey_trouble
• sum_double
• diff_21
• parrot_trouble
• makes_10
• near_hundred
• pos_neg
• not_string
• missing_char
• front_back
• front_3
• back_around
• or_35
• front_22
• start_hi
• icy_hot
• in_1020
• has_teen
• lone_teen
• del_del
• mix_start
• start_oz
• int_max
• close_10
• in_3050
• max_1020
• string_e
• last_digit
• end_up
• every_nth