syscall work, rename syscall to sysvar, rename current to clock (#5074)

* syscall work, rename syscall to sysvar, rename current to clock

* missed one

* nit

sdk/src/sysvar/rewards.rs

@@ -0,0 +1,70 @@
+//! This account contains the current cluster rewards point values
+//!
+use crate::account::Account;
+use crate::sysvar;
+use bincode::serialized_size;
+
+///  account pubkey
+const ID: [u8; 32] = [
+    6, 167, 213, 23, 25, 44, 97, 55, 206, 224, 146, 217, 182, 146, 62, 225, 204, 214, 25, 3, 250,
+    130, 184, 161, 97, 145, 87, 141, 128, 0, 0, 0,
+];
+
+crate::solana_name_id!(ID, "SysvarRewards111111111111111111111111111111");
+
+#[repr(C)]
+#[derive(Serialize, Deserialize, Debug, Default, PartialEq)]
+pub struct Rewards {
+    pub validator_point_value: f64,
+    pub storage_point_value: f64,
+}
+
+impl Rewards {
+    pub fn from(account: &Account) -> Option<Self> {
+        account.deserialize_data().ok()
+    }
+    pub fn to(&self, account: &mut Account) -> Option<()> {
+        account.serialize_data(self).ok()
+    }
+    pub fn size_of() -> usize {
+        serialized_size(&Self::default()).unwrap() as usize
+    }
+}
+
+pub fn create_account(
+    lamports: u64,
+    validator_point_value: f64,
+    storage_point_value: f64,
+) -> Account {
+    Account::new_data(
+        lamports,
+        &Rewards {
+            validator_point_value,
+            storage_point_value,
+        },
+        &sysvar::id(),
+    )
+    .unwrap()
+}
+
+use crate::account::KeyedAccount;
+use crate::instruction::InstructionError;
+pub fn from_keyed_account(account: &KeyedAccount) -> Result<Rewards, InstructionError> {
+    if !check_id(account.unsigned_key()) {
+        dbg!(account.unsigned_key());
+        return Err(InstructionError::InvalidArgument);
+    }
+    Rewards::from(account.account).ok_or(InstructionError::InvalidAccountData)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_create_account() {
+        let account = create_account(1, 0.0, 0.0);
+        let rewards = Rewards::from(&account).unwrap();
+        assert_eq!(rewards, Rewards::default());
+    }
+}