Detect the presence of any typos in this sentence.
He didnt know what to doo.
There are two typos in the sentence. "didnt" should be "didn't" with an apostrophe to indicate the contraction of "did" and "not." Also, "doo" should be "do" with only one o.
Complete the following task based on the instruction and optional input provided.### Instruction:
Detect the presence of any typos in this sentence.

### Input:
He didnt know what to doo.

### Output:
There are two typos in the sentence. "didnt" should be "didn't" with an apostrophe to indicate the contraction of "did" and "not." Also, "doo" should be "do" with only one o.