pub trait StringConvExt {
// Required methods
fn to_gwei(&self) -> Result<Decimal, ConversionError>;
fn to_eth(&self) -> Result<Decimal, ConversionError>;
fn to_u256(&self) -> Result<U256, ConversionError>;
}pub trait StringConvExt {
// Required methods
fn to_gwei(&self) -> Result<Decimal, ConversionError>;
fn to_eth(&self) -> Result<Decimal, ConversionError>;
fn to_u256(&self) -> Result<U256, ConversionError>;
}