# 127. BigDecimal subtraction

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This is a follow-up on 126. BigDecimal addition

In this problem, you are asked to **implement the subtraction of two decimals with arbitrary digits**.

```
subtract('-999999999999999999', '-1')
// '-999999999999999998'
subtract(
'-999999999999999999.999999999999999999999999999999',
'1.0000000000000000000000000001')
// '-1000000000000000001.000000000000000000000000000099'
subtract(
'999999999999999999.999999999999999999999999999999',
'-1.000000000000000000000000000001')
// '1000000000000000001'
```

- This problem covers 77. implement BigInt subtraction with sign.
- trailing zeroes in the result should be removed.