amount
Converts a positive decimal amount string to its base-units value scaled by decimals decimal places.
Rejects scientific notation, empty or non-numeric strings, values less than or equal to zero, and values carrying more fractional digits than decimals allows.
Return
The base-units value as a BigInteger
Parameters
amount
Positive decimal amount string (e.g., "10", "100.5")
decimals
The token's decimal scale; must be in 0..MAX_TOKEN_DECIMALS. A value of 0 accepts only integer amounts.